The Ultimate Guide to High Availability with MariaDB
This is a read-only copy of the MariaDB Knowledgebase generated on 2024-11-15. For the latest, interactive version please visit https://mariadb.com/kb/.

EXTRACT

Sintassi

EXTRACT(unità FROM data)

Spiegazione

La funzione EXTRACT() utilizza gli stessi specificatori di unità usati da DATE_ADD() e DATE_SUB(), ma invece di effettuare operazioni aritmetiche estrae le parti della data richieste.

Esempi

MariaDB [(none)]> SELECT EXTRACT(YEAR FROM '2009-07-02');
+---------------------------------+
| EXTRACT(YEAR FROM '2009-07-02') |
+---------------------------------+
|                            2009 |
+---------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT EXTRACT(YEAR_MONTH FROM '2009-07-02 01:02:03');
+------------------------------------------------+
| EXTRACT(YEAR_MONTH FROM '2009-07-02 01:02:03') |
+------------------------------------------------+
|                                         200907 |
+------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT EXTRACT(DAY_MINUTE FROM '2009-07-02 01:02:03');
+------------------------------------------------+
| EXTRACT(DAY_MINUTE FROM '2009-07-02 01:02:03') |
+------------------------------------------------+
|                                          20102 |
+------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT EXTRACT(MICROSECOND FROM '2003-01-02 10:30:00.000123');
+--------------------------------------------------------+
| EXTRACT(MICROSECOND FROM '2003-01-02 10:30:00.000123') |
+--------------------------------------------------------+
|                                                    123 |
+--------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]>
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